Chapter IV: Internal Muscles of the Thigh

The =sartorius= arises by two heads, one from the tendon of the psoas minor and the iliac fascia, the other from the shaft of the ilium. The femoral vessels pass between them.

The =gracilis= is more extensively united with its fellow than in the horse.

FIG. 221.—LEFT TARSUS OF OX WITH SYNOVIAL SHEATHS AND BURSÆ INJECTED,
EXTERNAL VIEW.

_1_, Peroneus tertius; _1′_, tendon of _1_ and its sheath, _1″_; _2_,
extensor digiti tertii proprius; _2′_, tendon of _2_; _2″_, common
sheath of tendons of extensor digiti tertii and extensor digitalis
longus (_3_, _3′_); _4_, peroneus longus and its sheath, _4′_; _5_,
extensor digiti quarti and its sheath, _5′_; _6_, tendon of
gastrocnemius; _7_, superficial digital flexor and its sheath, _7′_;
_8_, tendon of tibialis anterior; _a_, tibia; _b_, proximal annular
ligament; _c_, tarsus; _d_, distal annular ligament; _e_,
metatarsus; _f_, external lateral ligament. (After Schmidtchen.)
]

FIG. 222.—LEFT TARSUS OF OX WITH SYNOVIAL SHEATHS AND BURSÆ INJECTED,
INTERNAL VIEW.

_1_, Peroneus tertius; _2_, tendon of tibialis anterior with sheath,
_2′_, and bursa, _2″_; _3_, long digital flexor and _3′_, its
sheath; _4_, tibialis posterior; _5_, deep digital flexor and its
sheath, _5′_; _6_, tendon of gastrocnemius and bursa, _6′_; _7_,
superficial digital flexor and its sheath, _7′_; _8_, subcutaneous
bursa; _a_, tibia; _b_, proximal annular ligament; _c_, tarsus; _d_,
metatarsus. (After Schmidtchen.)
]

The =pectineus= is large, and arises by a single head from the pubic crest and prepubic tendon. It divides into two branches, one of which is inserted as in the horse, while the other extends to the internal epicondyle of the femur.

The =adductor= resembles that of the horse, but does not reach to the internal condyle.

The =quadratus femoris= and =obturator externus= resemble those of the horse.

The =obturator internus= arises from the ischium only, and its tendon passes through the obturator foramen.

The =gemellus= is large.